Direct imaging of multiple planets orbiting the star HR 8799.
Christian Marois,Christian Marois,Christian Marois,Bruce Macintosh,Travis S. Barman,Barry Zuckerman,Inseok Song,Jennifer Patience,David Lafrenière,René Doyon +9 more
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TLDR
High-contrast observations with the Keck and Gemini telescopes have revealed three planets orbiting the star HR 8799, with projected separations of 24, 38, and 68 astronomical units.Abstract:
Direct imaging of exoplanetary systems is a powerful technique that can reveal Jupiter-like planets in wide orbits, can enable detailed characterization of planetary atmospheres, and is a key step toward imaging Earth-like planets. Imaging detections are challenging because of the combined effect of small angular separation and large luminosity contrast between a planet and its host star. High-contrast observations with the Keck and Gemini telescopes have revealed three planets orbiting the star HR 8799, with projected separations of 24, 38, and 68 astronomical units. Multi-epoch data show counter clockwise orbital motion for all three imaged planets. The low luminosity of the companions and the estimated age of the system imply planetary masses between 5 and 13 times that of Jupiter. This system resembles a scaled-up version of the outer portion of our solar system.read more
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Do two-temperature debris discs have multiple belts?
Grant M. Kennedy,Mark C. Wyatt +1 more
TL;DR: In this article, the authors present a study of two-temperature disks whose spectra are well modelled by dust emission at two different temperatures, and explore whether this emission can arise from dust in a single narrow belt, with the range of temperatures arising from the size variation of grain temperatures.
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THE GEMINI NICI PLANET-FINDING CAMPAIGN: DISCOVERY OF A CLOSE SUBSTELLAR COMPANION TO THE YOUNG DEBRIS DISK STAR PZ Tel*
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TL;DR: In this article, the discovery of a tight substellar companion to the young solar analog PZ Tel, a member of the β Pic moving group observed with high-contrast adaptive optics imaging as part of the Gemini Near-Infrared Coronagraphic Imager Planet-Finding Campaign, was reported.
Journal ArticleDOI
Direct-imaging discovery of a 12–14 Jupiter-mass object orbiting a young binary system of very low-mass stars
P. Delorme,Jonathan Gagné,Julien Girard,A-M. Lagrange,Gael Chauvin,Marie-Eve Naud,David Lafrenière,René Doyon,Adric R. Riedel,Mickael Bonnefoy,Lison Malo +10 more
TL;DR: In this article, the authors reported the direct-imaging discovery of 2MASS J01033563-5515561(AB)b, a 12-14 M Jup companion at a projected separation of 84 AU from a pair of young late-M stars.
Journal ArticleDOI
BANYAN. VII. A New Population of Young Substellar Candidate Members of Nearby Moving Groups from the BASS Survey
Jonathan Gagné,Jacqueline K. Faherty,Jacqueline K. Faherty,Kelle L. Cruz,Kelle L. Cruz,David Lafrenière,René Doyon,Lison Malo,Adam J. Burgasser,Marie-Eve Naud,Étienne Artigau,Sandie Bouchard,John E. Gizis,Loic Albert +13 more
TL;DR: The results of a near-infrared (NIR) spectroscopic follow-up survey of 182 M4-L7 low-mass stars and brown dwarfs (BDs) from the BASS for candidate members of nearby, young moving groups (YMGs) were presented in this paper.
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Clouds in the coldest brown dwarfs: fire spectroscopy of ross 458c
Adam J. Burgasser,Adam J. Burgasser,Robert A. Simcoe,Robert A. Simcoe,John J. Bochanski,Didier Saumon,Eric E. Mamajek,Michael C. Cushing,Mark S. Marley,Craig W. McMurtry,Judith L. Pipher,William J. Forrest +11 more
TL;DR: In this article, the authors report evidence of condensate opacity in the near-infrared spectrum of the brown dwarf candidate Ross 458C, obtained with the Folded-Port Infrared Echellette (FIRE) spectrograph at the Magellan Telescopes.
References
More filters
Journal ArticleDOI
Object tracking: A survey
TL;DR: The goal of this article is to review the state-of-the-art tracking methods, classify them into different categories, and identify new trends to discuss the important issues related to tracking including the use of appropriate image features, selection of motion models, and detection of objects.
Journal ArticleDOI
Validation of the new Hipparcos reduction
TL;DR: In this article, a new reduction of the Hipparcos data was published, which claimed accuracies for nearly all stars brighter than magnitude Hp = 8 to be better, by up to a factor 4, than in the original catalog.
Journal ArticleDOI
Allen's astrophysical quantities
TL;DR: In this paper, Cox et al. introduce a general constant and unit model for general constants and units, and discuss atoms and molecules in the solar system, including Planets and Satellites.
Journal ArticleDOI
Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 209458
TL;DR: In this article, the authors present evolutionary models for cool brown dwarfs and extra-solar giant planets and show that irradiation effects can substantially affect the radius of sub-jovian mass giant planets.
Journal ArticleDOI
Measuring Distance and Properties of the Milky Way’s Central Supermassive Black Hole with Stellar Orbits
Andrea M. Ghez,Samir Salim,Nevin N. Weinberg,Nevin N. Weinberg,Jessica R. Lu,Tuan Do,J. K. Dunn,Keith Matthews,Mark Morris,S. Yelda,Eric E. Becklin,T. Kremenek,Milos Milosavljevic,J. Naiman,J. Naiman +14 more
TL;DR: In this paper, the authors reported new precision measurements of the properties of our Galaxy's supermassive black hole, based on astrometric and radial velocity (RV; 2000-2007) measurements from the W. M. Keck 10m telescopes.